The pressure relief device for ears includes first and second ear assemblies, corresponding to first and second ears of a user, and a resilient headband. Each of the first and second ear assemblies includes a hollow vapor chamber, an earpiece, a container and an absorbent pad. The hollow vapor chamber includes an upper portion and an open lower portion. An open internal channel is formed through the hollow vapor chamber. The earpiece has an opening formed therethrough and is adapted for engaging the corresponding ear of the user. The earpiece is secured to the upper portion of the hollow vapor chamber, and the opening is in open fluid communication with the open internal channel. The container is releasably secured to the open lower portion of the hollow vapor chamber and is in open fluid communication with the open internal channel. The absorbent pad is removably received in the container.

The pressure relief device for ears includes first and second ear assemblies, corresponding to first and second ears of a user, and a resilient headband. Each of the first and second ear assemblies includes a hollow vapor chamber, an earpiece, a container and an absorbent pad. The hollow vapor chamber includes an upper portion and an open lower portion. An open internal channel is formed through the hollow vapor chamber. The earpiece has an opening formed therethrough and is adapted for engaging the corresponding ear of the user. The earpiece is secured to the upper portion of the hollow vapor chamber, and the opening is in open fluid communication with the open internal channel. The container is releasably secured to the open lower portion of the hollow vapor chamber and is in open fluid communication with the open internal channel. The absorbent pad is removably received in the container.

A computer device may include one or more electronic components located in a passive cooling zone. A wall divides the passive cooling zone from an active cooling zone and acoustically isolating the active cooling zone from the passive cooling zone. A heat sink attached to at least one of the one or more electronic may extend from the passive cooling zone to the active cooling zone through the wall. At least one noise emitting component may be located in the active zone. A method of controlling noise in the computer device may include determining, by a processor of the computer device located in the passive cooling zone, a noise frequency of a noise emitting component located within an active cooling zone of the computer device. The processor may control a speaker within the active cooling zone to emit anti-noise cancelling the noise frequency.

A hearing protection system including an earplug moveably displaceable in a plane covering an ear of a user from an open position to a closed position in response to a signal received from a trigger mechanism. When in the open position, the earplug is positioned adjacent to the ear of the user to allow the user to hear ambient sound at an unchanged volume. When in the closed position, the earplug is positioned over the ear of the user to at least partly block the ambient sound and allow the user to hear the ambient sound at a reduced volume that is less than the unchanged volume.

Embodiments relate generally to methods for customizing speakers in hearing protection earcups in conjunction with an amplifier so that the maximum speaker output may be capped, for example to acceptable OSHA or other such standards. By customizing such speaker(s), the maximum speaker output may be set precisely at the desired cap level. Thus, hearing may be protected, while also ensuring that maximum speaker output will not undershoot the desired cap level (which might negatively affect performance).

An apparatus includes a sensor module configured for receiving sensed information indicative of a sensed signal. The sensed signal includes a source signal component and a source noise component. The apparatus also includes a reference module configured for reference information indicative of a reference signal. The reference signal also includes a reference noise component. The apparatus also includes a filter module configured as a fixed lag Kalman smoother. The filter module is configured for adaptively filtering the reference signal to generate an estimate of the source noise component. The apparatus also includes a processing module configured for calculating an output signal based on the sensed signal and the estimate of the source noise component. The apparatus also includes an interface module configured for transmitting an indication of the output signal. The filter module is further configured for, based on the output signal, tuning the Kalman smoother.

An ear covering system for keeping ears warn while wearing earphones includes a pair of earphones. Each of the earphones is selectively worn in an associated one of a pair of ears. A pair of earmuffs is provided and each of the earmuffs is selectively worn on an associated one the ears. Each of the earmuffs has a hole therein and each of the earphones is selectively extended through the hole in an associated one of the earmuffs. In this way the earmuffs are worn in conjunction with the earphones. Each of the earmuffs is comprised of a fluid impermeable material to keep the ears warm in a cold environment.

The application describes a MEMS transducer in which first and second conductive elements of a capacitor are both provided on the membrane. The membrane is shaped that the first and second conductive elements are displaced relative to each other when the flexible membrane deflects in response to a pressure differential across the membrane. For example the membrane may be corrugated.

A noise and vibration sensing system is provided. The sensing system includes an acceleration sensor arrangement and a summer module. The acceleration sensor arrangement includes at least one acceleration sensor and is configured to generate at least two sense signals representative of acceleration that acts on the acceleration sensor arrangement. The at least two sense signals includes dynamic ranges that are ratios between maximum amplitudes of the at least two sense signals and noise created by the acceleration sensor arrangement. The summer module is configured to sum up the at least two sense signals to provide a sum signal that includes noise and a dynamic range which is a ratio between a maximum amplitude of the sum signal and the noise included in the sum signal. The dynamic range of the sum signal is greater than the arithmetic mean of the dynamic ranges of the at least two sense signals.

A quiet toilet apparatus disclosed. Microphones and circuitry are used to receive and detect one or more virtual point source locations and propagation directions of unwanted toilet noise. Speakers are used to create one or more synthesized wave fronts resulting in cancelation and reduction of unwanted toilet noise. The speakers, microphones and circuitry may be located within a toilet seat of a toilet or at a remote location. A user device or remote device may be connected to the noise reduction toilet apparatus for data recording, collection, reporting, and electronic noise filtering.